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Planning guideOperating modesThe operating mode defines the permissible motor activation period.Fundamentally, it is to be made sure that the installed temperaturemonitor of the motors is correctly connected. This ensures that thetemperature classes of the windings are complied with if the operatingtime is exceeded or incorrect operating mode is used.S1 permanent operationDefinition:Operation at a constant load which is maintained until the machine isable to reach the thermal steady state.The machine is designed such that the cooling under nominal conditionsis sufficient. The operating mode provides no information aboutwhether the machine is to be operated wet or dry, however. If no operatingmode is specified on the rating plate of a machine, S1 permanentoperation applies.S2 short-term operationDefinition:Operation at a constant load, the duration of which is not sufficientto reach the thermal steady state, and a following time at a standstill,in which the machine temperatures, which have dropped again, onlydeviate from the coolant temperature by less than 2K.The power dissipation of the machine is greater than that which canbe conducted away via the coolant. For S2, the permissible operatingtime is always specified (e.g. S2 15 min). After this operating time,the machine must cool back down to the ambient temperature. Thisoperating mode is mainly used with dry set-up machines.PPtP VtP VttΘΘ maxΘΘ maxP = loadΔt PtP = loadP V = electrical losses = temperature max = max. temperaturet = timeT C = cycle durationt p = operating time at constant loadt R = standstill time with no current in windings,relative activation period = t P /T CtP V = electrical losses = temperature max = max. temperaturet = timeT C = cycle durationt p = operating time at constant loadt R = standstill time with no current in windings,relative activation period = t P /T C14 Wilo Water Management catalogue – 50 Hz – Drainage and Sewage – Waste water collection and transport – Edition 2012/2013 – Subject to change without prior notice
Planning guideOperating modesS3 intermittent operation without influence on the startingcurrentDefinition:Operation which is composed of a sequence of identical cycles, ofwhich each one involves an operating time with a constant load and astandstill time, whereby the starting current has no noticeable effecton the excess temperature.The power dissipation of the machine is greater than that which canbe conducted away via the coolant. With operating mode S3, the cycleduration is specified in percent and the cycle time is also specified.Example for S3 25% 10 min: The activation period is 2.5 min and thepause is 7.5 min. If no cycle duration is specified, a cycle duration of10 min. is assumed.PT CΔt PΔt RtP VtΘΘ maxP = loadP V = electrical losses = temperature max = max. temperaturet = timeT C = cycle durationt p = operating time at constant loadt R = standstill time with no current in windings,relative activation period = t P /T CtWilo Water Management catalogue – 50 Hz – Drainage and Sewage – Waste water collection and transport – Edition 2012/2013 – Subject to change without prior notice15
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